Application of Titanium alloy in exhaust valve of automobile

      The valve made of titanium alloy can not only reduce the weight and prolong the service life, but also have high reliability and save fuel. In addition to heat and wear resistance, the exhaust valve should be free of lead and cobalt. It is common for American manufacturers to make inlet and exhaust valves with titanium alloy. Intake valves are made of Ti-6A1-4V alloy, while exhaust valves are made of Ti-6a1-2Sn-4Zn-2MO alloy. Sinter inlet valves manufactured by Hitachi are supplied to the Japanese automotive industry market.

      The main models with titanium alloy exhaust valves from the original factory are infiniti 4.5 V8, Lexus 5.0 V8 and GM LS7, LS9, LSA and LT4. The use of titanium valves in general V8 engine is mainly considered in the design of two valves per cylinder, the weight of each valve is larger. The design of a sodium filled valve is to fill a hollow valve rod with sodium and to transfer heat to the top through the flow of liquid sodium up and down.

      In addition, performance-oriented or retrofitted engines are often made with nickel-chromium or titanium, which provides about 40 percent weight loss